<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Hello world</title>
</head>
<body>
    <%
        int a = 5; String ss ="ssss";
        String num = request.getParameter("username");
    %>
    <h1>Hello world! <%=ss%>(jsp)<%=a%>mmmm:<%=num%></h1>
</body>
</html>
